"We're going to let it quiet down," Luebke said.
On Wednesday, Luebke had a platelet-rich plasma injection (PRP). PRP treatment involves extracting blood from the patient, spinning it in a centrifuge to isolate certain platelets in the blood. The blood is then injected back into the body with the hope that those platelets can aid in the healing process.
Earlier this year, Luebke's throwing program was shut down for six weeks after he experienced soreness.
Luebke had reached the point last week where he was able to play catch off a mound. But now, he is uncertain when he'll be able to start throwing again.
"This is not an exact science of how a guy comes back from a major surgery," said Padres manager Bud Black. "Not all of them meet specific timelines. Cory is on the longer end of a projected return.
"But I feel bad for Cory. He wants to play."
Luebke has maintained throughout his rehabilitation that he intends to pitch again this season. He has not appeared in a game since April 27 of last season. He's 10-12 with a 3.25 ERA in 55 games over the last three seasons for the Padres, including 25 starts.
Luebke signed a contract extension during Spring Training of 2012 that guaranteed him $12 million with the potential of earning him $27.75 million and keeping him in San Diego through the 2017 season.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.